CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: jockwalker on January 20, 2022, 01:30:52 PM

Title: Correct Engine Pad Stamp?
Post by: jockwalker on January 20, 2022, 01:30:52 PM

My engine pad stamp on my 67 rs was decked many years ago. Trying to find what should have been stamped.I finally was able to locate the engine block date code and found it to be: L66. (Dec 6,1966) I assume. 327/275hp was made in Flint. Suffix is MN.
Car was built third week of December1966. So, with that information, would the pad be stamped: V1206MN? Is engine date code the date stamped on the pad? Thx!

Title: Re: Correct Engine Pad Stamp?
Post by: 69Z28-RS on January 20, 2022, 02:23:20 PM

That's as good a 'guess' as any, but there's no way to be certain... unless you had the protectoplate..

Title: Re: Correct Engine Pad Stamp?
Post by: jockwalker on January 20, 2022, 03:16:50 PM

I do have the protectoplate

Title: Re: Correct Engine Pad Stamp?
Post by: jockwalker on January 20, 2022, 03:41:38 PM

Protectoplate’s info: T1207MN
Built in Tonawanda
December 7, 1966
327/275hp. 4 barrel/powerglide/AIR

Title: Re: Correct Engine Pad Stamp?
Post by: jockwalker on January 20, 2022, 03:52:00 PM

So, even though the date code on the back of the engine is Dec. 6, 1966, the stamp will read Dec. 7 since that is on the protectoplate?
I assumed V for Flint Michigan would preface the date since that is where 8 cylinders were built. But since there is a T on the protectoplate, it was built in Tonawanda not Flint?

Title: Re: Correct Engine Pad Stamp?
Post by: Stingr69 on January 20, 2022, 09:07:06 PM

Tonawanda built both big blocks and small blocks. 

Title: Re: Correct Engine Pad Stamp?
Post by: 69Z28-RS on January 20, 2022, 11:11:15 PM

Quote from: jockwalker on January 20, 2022, 03:52:00 PM

So, even though the date code on the back of the engine is Dec. 6, 1966, the stamp will read Dec. 7 since that is on the protectoplate?
I assumed V for Flint Michigan would preface the date since that is where 8 cylinders were built. But since there is a T on the protectoplate, it was built in Tonawanda not Flint?

Yes.   The date on the rear of the block is the date that the BLOCK was cast.  The stamped date on the front pad is when the ENGINE was assembled, and that is what is shown on the protectoplate.

PS.  Tonawanda built std small blocks and ALL big block engines, whereas Flint built ALL the high performance small blocks (plus std small blocks).

Title: Re: Correct Engine Pad Stamp?
Post by: jockwalker on January 21, 2022, 12:15:40 AM

Thx for the help and verification. I have owned my rs for 8 years and now I know.

Title: Re: Correct Engine Pad Stamp?
Post by: bcmiller on January 21, 2022, 02:12:39 AM

I advise you to leave the block as is and NOT have it restamped, if that was your plan.

Title: Re: Correct Engine Pad Stamp?
Post by: jockwalker on January 21, 2022, 02:31:30 AM

No. Just trying to document as much as I can. No reason to restamp it. Never plan on selling it and it’s not like it is a Z28 that brings big bucks. Just nice to know it is as original as I hoped when I bought it.
It’s been an enjoyable process.

Title: Re: Correct Engine Pad Stamp?
Post by: bcmiller on January 21, 2022, 04:38:53 AM

Cool. It’s always good to see examples of confirmed casting dates compared to assembly dates.